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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fcc3f0ae239105d63c9ee6866c0577ff299e3ce87aef044984c99176cdd1a8f' 
  AND token = 'ZCxUyC2XDaU0RdK/V9yi95FUnI2WQuqvO+dJ99RGinY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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