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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a410b67420f9d94f49a0262bcc86eb615454aeec25d6d947a39e716ed9d5ce2' 
  AND token = 'gf+vmy85T9zQ150e7mTvtqL+bNy2KUdvcl+e7O8Z6M0=' 
  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"
    }
  }
}