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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '631bd860256ebbbb54e215a3ed412056e8e5a0b5957392084893f2bb65ee09b1' 
  AND token = '5emjXN1PkJDEJC8Q3NLXM6pAZXYH9CUW1DRHQowgAFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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