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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e726afbb70e70ef8cb44ab082808027c9d92f43554509a3d951b4b1f1a97aa2' 
  AND token = 'LVXR4sNI3/w/wDa5VrN5YQehz/xeIhn+wDECOy+15Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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