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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b932cedefb9f5f565654f26b23a8b58a099c44f2b9e0a387e908389e8f1c3d0' 
  AND token = 'IGfbrKGf+wlkyS7aCQEs7znB5prqp0d1mS7xdUvP0Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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