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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eef0ef93a862cb941653262cd54f01c6fb63530d262d98776b14ad461118d7d' 
  AND token = 'HSU+bZCnrZ9zZgpjzC2oi3NJ9KAK92BOI07AiXXjK9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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