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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dbbc67d787d482ff5f553a34b603b83c84c520e84c3a36bc759a141f0aa8d22' 
  AND token = 'qbPjFAGDB2yoL0y2ztsUPBUVM/DdU+pHavfk5mO0AiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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