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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804490b1ca79c2b1f87416b99ffdb674d79106f1eaeb514b0cb66c65eb2f5674' 
  AND token = '6GEH7v2ZU8C13GGDn65rSKH9YR1cGi7xKD+uDBRMlcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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