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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdd6498946a3f78e7b1cd1983ae543113b21dd976cecc43d733de4ee94dde161' 
  AND token = 'JDr2KpKBWnP1hxG2I99uOiPcFfyTqL0fmjgbwgy7IFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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