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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bf28d9f45ad64e6a4fadd8e370f474ac61375c16169564349217d002fc24abc' 
  AND token = 'x2mxtNYrAceMqoGsbBHCDUQajG+K0Onlm8s/JfdYfE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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