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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0a49c757065343e0a41b3d302946708f4e322e6a755ec6a321d51df047410d' 
  AND token = 'GL5iJrF4+mvdfcm6Yf8QTDtVmMWKbWnPYCanNN49tyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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