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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f632862d9cb347b949ee2fafbd08c423242eb81743d7d11f4532e20121739d1' 
  AND token = 'I2cq7fusxJV2kPJKTY2LoM+tiwvq1/cHPsR15odgHQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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