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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03eedb999aad6fb4db6dbd60694f5cb6cf039aa2e62448a450e71fc49b433819' 
  AND token = 'Ig/7dZgcdoyR1dB35g6bpE7pZh2ktxQTfRbC3YQHMF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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