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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '965a18c70a8b7859aec5f26ed69c39e2e5459568296ba2552f6e569c588d246b' 
  AND token = 'O/EDYN+QIVBn9q8meipY7I3UeSWbwHheAEVsP54mVjo=' 
  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"
    }
  }
}