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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038cb30d33295a806c8fdd08fcda4554929e9a09ce904a531fa5bea852241119' 
  AND token = 'VeD7sENr2dYvHgKQpssvPWIV6FhusRpakIMBwBcYxg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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