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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97463cd3ff846c3c6d3d0fa868e3d4c2fd205c3da728625509916abff5627f2f' 
  AND token = 'AfthUGBdbiezaWuDPWLf87A5h3dS+WZO5FtMXlaU0yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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