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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a784c55ec1ee8563a16c1af2e87ccc987e3a6a506afb81ced7b59f07094e6bf' 
  AND token = '4ThRdXDfP++D9sJrr9Tg+GRPQRegkuDqfMkr3fHA2p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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