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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '621adba5ebfad8a1b8ac4f6eefd3245e80d091df86cdedfdaa0163844e671a67' 
  AND token = 'cGuG/51/HA9WvD/b2rHTi28zwBjRm5C3flk371unbn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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