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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35a52b4a0e91e5dc294870ba02339501fe92951e9c3d8bc1df49bd012ce19c9' 
  AND token = 'G9ax54qkTVET+95SC+KjZhO+JJhZ420HXoro+xAI9bw=' 
  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"
    }
  }
}