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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7209a076e9eee4acb120a655044aa155f7d082a5584eec2e1b48b82bdedcc329' 
  AND token = 'XMzAFtN6arCKxTLJeLjJPQk4OhuGI4SgsuFQ4bZ3yt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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