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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd31b046711466142088a6fffc69557a2fbf0598f7d6deb6df9e2dd2b2feac677' 
  AND token = 'PywiOb7H/tatla38guRGZCP1ReW4BbqOz5U85vI1pvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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