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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9755a093a386454a0aa6b9297da05cb421844180c0fc48b785249503037c77d7' 
  AND token = 'DVI8AyF106wg6opy4KkIA1WsuzbzAQW9LC5WYirWWL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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