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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '682797300a05fd3beeb8bfec9052ed26e77677b3031845497da34a6be63ef557' 
  AND token = 'Ow1z64v6j45jyVrR5a8BEf+KXO9CjBKXOXd2dwLVXek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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