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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b7a6737deb879c4eb862dd46d08a48c76b7481765d5d5b7d83f99650ec0d2c5' 
  AND token = 'uX84na1LKvIEvtXxqNHoZtzCEuGlNN/DI31s+W5SZio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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