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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a941eb25ee10b4434f0f960b3fe695a2f1fde0a3c2cbb1fec16d78f2c567c712' 
  AND token = 'd65VG5L1gF3CAW+rG4l2+PaqJI733BGvucgwJqeULC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}