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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b93b7eb24238aa71c6248f212d30e333a27b13d527aae985a129c6311aca0f6' 
  AND token = '0f3XkA6c3g/cAzXdJif8whgLc7DU3jYxTplO0d50KG0=' 
  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"
    }
  }
}