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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27290eb36fd2af8369dd7ee751dc721cd8a8e727fad71cd6196089be8dfc4526' 
  AND token = 'FkI5dF8AH5bWg3SZgt4WRCKA/YVcBfUNrWoBV7XBsGw=' 
  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"
    }
  }
}