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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8559535cc0d239549976dbdd85483ac63189b5534753e2f1df74e6b4d942de14' 
  AND token = 'Y8yu+4dZIFhqtSyfU4JCbqDOVcDox7WkM092n6Pk5GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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