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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ffeed3caac9a2af0a81aab3e758b081140d19e8efbe3352a5c9e1cf25f0dc06' 
  AND token = 'YQ806u7JBYPNnG6nvP4QXxVLxxnKkutDENIgBDeTwX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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