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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa675235506057ab58b66325288a0ed7d70b43caf302c17ad666f6cf3485ce64' 
  AND token = 'PKaeMT1mkvYe7uFpxchDn8hVLdih2Q7bD++CkV8aRKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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