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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e4d6b77e40f1e37b9b8c17564d0091f5f8d77ce19cc23ac6345a4ecc30d8fcb' 
  AND token = '6iZ3wk4cfAdA4R05LFmKypSEDtu8iFoiAEQpE1e+des=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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