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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23546aecf134e32e0b51e39504fd4ba98aa2394b24eb2e2365b01670b9228851' 
  AND token = '2LIrb8da6n1SQ/MPvDms/XcUYuBeOb67NCrwVnW5Whc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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