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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f26875afbd98f4cdbe50c4e2514a02e380eafcc931b651facdd4e74164070a31' 
  AND token = '1LA5VGaMrkij6Izbp2tG38dQxgTVPfw2zxSF8wWIdQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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