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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b58662398b9fa6f94b44188e16859451f672769b1bd74490738e3721be19fabd' 
  AND token = 'e9LCs4j3FGMg0TANhnTQ2miiu43S01YTP26wAV1IdQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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