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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee79869e0a33e3a866f4d0a8fab88772307a38acfaa9a2e133c593e7b880bdd' 
  AND token = 'fFw29yiQWxza9jRCtAXPR4PfFPTX9QhUMnlsFJ2hZyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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