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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae79fedd89737a9685b160146304c53c45a37ed2ef4c809431990d1748bf8a6' 
  AND token = 'Es7YJivO+O+xtbHX17JHCMA2BDUTvMrGUIYu06gfaXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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