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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2244bac117dc65636ca9dc8939d10b8303b073fe1e55a085629015725ca4f02b' 
  AND token = '5YssmLjg6jNJV1wrBMQmawK9s6Wlk9r2uw9H8Dwfih0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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