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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d38de42479bc1ce6ff129a24eb1f3ab522723c09e50f5192b52f51b89db6cf' 
  AND token = 'GXJ7vN/0LxIs3PYaocV3aefkOH8n0forSkJc9LTKlfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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