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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '720b0909e247266b3264c5367835337ec900772494c55bc161bc7860804d9f6b' 
  AND token = 'XfmB/hbcuf9XvP2FigTf71nXFKCF1b8Lw1nS4WNDPUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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