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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '420e4675c63ef0743512bacaa266b0548d4d86f3900e583757a86a41c7b92957' 
  AND token = 'yn1Ojo8o60m+hBJQr/fAfoNY/jC9Wt2K+pAHQ65/I2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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