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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9de744494b7b8e8f52ddf8a3d0dc5c30aa426a632eb35deafcca5bc79c7a3b' 
  AND token = 'nA6EgVDzYdmkrdCIYzu7kt47cSUZVaYCYDJPSs+Rz7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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