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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1c3b67888d6a9a2824d8404cbf4562e42c97d99d94887092951340978d4a9ec' 
  AND token = 'fgW/ig9ilRejvHO1Sv9hcUELvgNLOCnnnCK6WMan/hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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