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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5904e285cf622a1146e9be75c7966798232d44d4f753d7bd811847620c71f0a2' 
  AND token = 'JDYx0IpDw8On1YH18g+zkYkjAR4W3ztin7GFqOEQS7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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