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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '106df127c1daf80cbd8918908597d73a8696c250b26124588d83cd2e6b9e21dc' 
  AND token = 'srUh5sj7iB9S5OoBj989p9WlHegh1Z44zyeKTJJtXRM=' 
  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"
    }
  }
}