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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8aa829a7adcb1f8e6331fa7fb45d23d66245bbabb44c26fde805824c4e1f2b0' 
  AND token = 'PEXMxX00iVM3H6voKwnZmAYj6r4M1bbh30D02xE8z8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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