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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a28209f176e1a7dfea50fc7bb4f7ad504e336f6c3443ebc64278182a4b436677' 
  AND token = 'cna78q0lCbeRwGUTXJ+M/RuK/woWagVJr/Ai0gH8xGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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