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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '384b2542e1f83aaa022adb4b42fd8e786b7d678f3c2bc5344305ef4ecb14dc5c' 
  AND token = 'WS+yvFB0edR+w5q5/3rKgK6hHfsiAniLm781ax/plwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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