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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2f5b80d2abedd12f56b3b1dcdea68294dc4da3e24cd37c4a268e093111a235d' 
  AND token = 'tjA8q3Mo04TjzydkNyDdrYp0pIeIbreAzA5V91v3MY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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