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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '931c0d4c944a9657f1830f49cff1e8c5f6f18baf60b7f3ac90965e1c1fe4a967' 
  AND token = 'DUe9kqN9X2WblMTTVMc+EuvHVu5sHtxOZkMpEf664so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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