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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0fe2c7573476afc969fcd6b66b146fafa841e4c699442c0cb7783f57da5d4b5' 
  AND token = 'BlWmTORqMn7Gx3L03vmWBaT0TMQBwe0/vx5HE9WexJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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