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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93119e81f4d8492e2db8692fb49467cb0ff9f12a99c7660eb7fd8a0a7a031741' 
  AND token = 'oIWuc8Ezws3TsmFSoFmsv7if/xX/dlbj+bCt4+RV3pQ=' 
  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"
    }
  }
}