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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7522eb4f2059a2db19c75898fa9e1746a6b76142f00448f684df2c5d82c0b91f' 
  AND token = 'uNoRj6jG/AdXvm0AmPX6GbfhYgWifW1r0wAcD3hvQwM=' 
  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"
    }
  }
}