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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29a2827019f9e4f550ff4b817058c7972f9b7f0250a22b0c01a53b306cd2b5d7' 
  AND token = 'Y6W/c94Gf4UZQkBHsF+GQEe6KLlozT9jl36DEV6skDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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